Use pydocstyle to force pedantism on our docstrings via precommit hook

[rluce]

https://www.pydocstyle.org/en/6.3.0/usage.html

Maybe later ... for now it's a wall of warnings, e.g.:

 D401: First line should be in imperative mood; try rephrasing (found 'This')

Originally posted by @simonbowly in #86 (comment)

[simonbowly]

So much potential for pedantism, so little time ...